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Webster IC Engine build log.
HS93:
--- Quote from: craynerd on March 21, 2011, 12:45:46 PM ---Thanks for all the info regarding the piston o-ring. I`ll let you know how I get on.
dbvandy - I`m really not sure what I`m doing about ignition yet. A lot of it falls down to cost, what you showed me seems an excellent price. I`d quite like to use my smaller 10mm spark plug so I`m not sure if it`ll fit in place of the 14mm plug that comes with it. I`ve finally got my head around the points/contacts system that the original plans suggest but they look clunky and I believe I could do without them if I used the item you linked to?
Where or what is the hall sensor in this bundle and how will it be fitted?
I believe this is the sort of thing:
REMOVEhttp://www.youtube.com/watch?v=jeRE8SoxStU&feature=mfu_in_order&list=UL
...but it worked out about £90+ when I priced it up. Is it the same sort of thing in the link that you have suggested?
--- End quote ---
Why is it £90 + when it is only $29 in the advert postage is not that bad from hobbyking I get stuff all the time ?
peter
raynerd:
John, many thanks for your explanation. I`ll have a good read of the link you posted.
Peter - I`m sorry, I didn`t make myself clear. I`m not sure myself what I would need for this sort of setup and so from a UK supplier (who will remain nameless because they gave me copious amounts of advice and info) all the parts came to £90+ !! This is why I questioned this price at $29 - I didn`t think it would surely include everything I needed!
Chris
NickG:
Chris,
I think the one you're talking about will have been specifically designed for model engines such as yours, while the one pictured is a commercial thing for replacing ignition on lawn mower engines and the like? It's not exactly compact by the looks of it.
As Bogs said, it's the coil that costs the money, you're into electronics so could easily make the circuit up and microswitches can last a long time, are compact, cheap and easy to replace. The other way is to completely use the setup the original webster had, car / motorbike coil, battery and contact breakers. You'd need a big base to hide all that in though!
Have you thought about piezo like Jan ridders uses on some of his? I think they sap a lot of power though.
Nick
raynerd:
I`m just looking over this and your right, this really is a bargain as it works out at £20 including postage providing it doesn`t get caught up in customs. I have been stupid and didn`t see that it is fitted with a CM6 plug which is what I wanted to use anyway!! The link you sent John looks excellent and once I`ve got it running it might be something I experiment with for fun so that I can say it is truely all built including ignition but I expect I`ll have enough issues getting it running than worrying about building the ignition system as well. I think I`ll go ahead and order one of these for £20.
I hope it becomes obvious how to wire this up when it arrives! Will I need to use a car battery or could I use a battery pack to reduce size?
Also, looking at the video I posted, I noticed the hall sensor is attached to a modified axle of the second gear which is actually reducing the spark ignition to just spark once per two revolutions as per a normal 4 stroke right? I have been thinking, using the contacts (or the hall sensor) on the main crank shaft you`ll have a spark per revolution so does this mean one is redundant - does this matter?
Chris
EDIT: Nick, you posted while I was replying. To be fair, the size of this unit looks about the same size (infact looks the same thing) as what was quoted at £90 for but maybe I`m wrong. I wouldn`t say I`m into electronics, I can get by but I`m not always confident in what I`ve made. I`ve been considering the coil and points method but I don`t mean to offend anyone, but it does look a little clunky!! I`ve not looked into a piezo ignition so I`ll have to have a google of that! Working out the price of the unit that was suggested, I am still very much interested in that!
I do appreciate everyones advice... it would be much easier if there wasn`t all these options :D
HS93:
I think you will find it it is small sa it is for a model plane or boat or car. the box is less than 2" long by about 3/4 high mesuring it against the rc plugs in the pictute.
peter
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